Before "auto-layout" is done, I'd like to be able to have some invisible guidelines, so as to be able to align the elements.
My idea about them is that the center-most lower corner would be the 0,0 of x,y axis, against which the center-most lower corner of any other node would snap (around ~ +-20,+-20 pixels)
Optionally, the imaginary background grid could become snap-able on some modifier-down (e.g. Shift)